07-26-2017, 08:11 PM | #1 |
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6MT clutch and flywheel Upgrade?
Hey guys it's you're boy Chicken_Joe, you already know what it is........
Seriously though, I was at a stop light and took off a bit vigorously, not flooring it in 1st as I blow the tires off. Changed to second and floored it, hit 3rd and floored it again and then all of a sudden my rpms shot up and the car didn't go any faster. No tire spin that I could feel so that let me to believe that my clutch was slipping. Questions: 1. Is there some sort of sensor on the 6MT that acts in the same way the 8AT does that limits the torque or prevents it from hurting itself if it senses too much power? 2. I'm fairly sure my clutch slipped? What are your thots???? 3. Assuming I need to get a new clutch it would be wise to upgrade. I was looking at the following ---> Spec stage 2+ rated for 545 lb ft. 4. Should I upgrade my flywheel along with it? Options I have are; ---> Spec Aluminum (14lb) Flywheel or the Spec Steel (22lb) flywheel. Has anyone had issues like this before? If you have what did you do to correct the issue? (No I'm not going to pussy foot my car, I drive it hard.) What other options are there for clutch and FW upgrades. I would like to maintain stock-ish drivability but gain some performance in the tranny department. I don't launch control my car anymore due to having had the transmission replaced due to a bad 2nd gear synchronizer. Also, while my car is in the air I was thinking of buying a new slave cylinder and trying to do the CDV mod on a new OEM part and then install it later. Has anyone done this to theirs? I know the CDV is located inside the slave cylinder on the F30 so I understand the task at hand. Would deleting the CDV make my car more prone to tranny issues later on even with the upgraded parts? Thnx 4 Halp frenz
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13' 335i M Sport. EBII/Coral Red 6MT. RPI GT exhaust, Resonator delete, PS1, GFB DV , BM3 Stage 2, ER CP, VRSF DP, VRSF 5.5in Stepped FMIC, Dinan Shockware. Carbon M Performance rear diffuser. M4 trunk lip. Conti DWS06 225/40/19 and 255/35/19
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07-27-2017, 10:20 AM | #2 |
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That sucks, but hey, you get to upgrade with piece of mind. Not that I have direct knowledge, but some have said in other threads that the 550 clutch is pretty robust. I'm not sure how that compares to the Spec though in strength or cost.
I've also wondered about the advantages/disadvantages of going to an aluminum flywheel vs steel. Either way, good luck and I look forward to reading about the results. |
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07-27-2017, 11:41 AM | #3 | |
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13' 335i M Sport. EBII/Coral Red 6MT. RPI GT exhaust, Resonator delete, PS1, GFB DV , BM3 Stage 2, ER CP, VRSF DP, VRSF 5.5in Stepped FMIC, Dinan Shockware. Carbon M Performance rear diffuser. M4 trunk lip. Conti DWS06 225/40/19 and 255/35/19
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07-28-2017, 04:07 PM | #4 |
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What mods do you have that your clutch is going? I also have a 6mt so I'm a bit concerned.
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07-28-2017, 04:42 PM | #5 |
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JB4, DP, FMIC, CP, drop in Filter exhaust and I usually run E85 around e40 every other or every 2 weeks
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13' 335i M Sport. EBII/Coral Red 6MT. RPI GT exhaust, Resonator delete, PS1, GFB DV , BM3 Stage 2, ER CP, VRSF DP, VRSF 5.5in Stepped FMIC, Dinan Shockware. Carbon M Performance rear diffuser. M4 trunk lip. Conti DWS06 225/40/19 and 255/35/19
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07-28-2017, 04:48 PM | #6 |
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I am dealing with the same issue as of an hour ago...., How many miles do you have?
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07-28-2017, 04:55 PM | #7 |
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13' 335i M Sport. EBII/Coral Red 6MT. RPI GT exhaust, Resonator delete, PS1, GFB DV , BM3 Stage 2, ER CP, VRSF DP, VRSF 5.5in Stepped FMIC, Dinan Shockware. Carbon M Performance rear diffuser. M4 trunk lip. Conti DWS06 225/40/19 and 255/35/19
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07-28-2017, 09:39 PM | #8 |
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Have you looked into the 550i clutch? Seems to be a popular upgrade, not sure if it holds up well.
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07-28-2017, 10:26 PM | #9 |
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I'm not sure if it would fit in my car
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13' 335i M Sport. EBII/Coral Red 6MT. RPI GT exhaust, Resonator delete, PS1, GFB DV , BM3 Stage 2, ER CP, VRSF DP, VRSF 5.5in Stepped FMIC, Dinan Shockware. Carbon M Performance rear diffuser. M4 trunk lip. Conti DWS06 225/40/19 and 255/35/19
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07-28-2017, 10:51 PM | #10 |
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I have 6mt 435i. This is my first manual car. Although, I've been driving a manual for 2 years prior on my moms car.
There's been two instance when I'm shifting at WOT (from 2nd to 3rd) and the car doesn't speed up, but the rmps still climb if I continue to press the gas pedal. Once I ease off the gas and reapply pressure on the gas pedal, the car acts normals and picks up speed. Really weird; have never experienced anything like this before. Mods include: DP, CP, JB4 |
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07-29-2017, 12:01 AM | #11 | |
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13' 335i M Sport. EBII/Coral Red 6MT. RPI GT exhaust, Resonator delete, PS1, GFB DV , BM3 Stage 2, ER CP, VRSF DP, VRSF 5.5in Stepped FMIC, Dinan Shockware. Carbon M Performance rear diffuser. M4 trunk lip. Conti DWS06 225/40/19 and 255/35/19
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07-29-2017, 07:20 AM | #14 |
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That's definitely clutch slip.
Last edited by mr_kay; 05-09-2019 at 08:28 AM.. |
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07-29-2017, 12:40 PM | #15 | |
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Real clutch slip is like what others have said, if you lay into it when in 4th or 5th, and it starts slipping. Thats when you need to upgrade the clutch itself. So Ive been researching the CDV quite a bit, looks like all E9x slaves bolt up, this is becuase the updated P/N for E-series is our F3x slave. So they definately bolt right in. Problem is we will need to source the older metal slave cylinders which has an external CDV, and need to source the older slave line. You can still find the metal E9x slaves online new, but I cannot seem to find the clutch line for it (new)..... ChickenJoe: Can you provide any info on this CDV mod for our F-series built-in CDV? The only option I see currently is to have a hydraulic shop make me a new line from master cylinder to slave. Also anyone know if the E46 slave is the same as the E90? I hope so because then we can get those new and for cheap. Also#2.....the E82 (1-series) slave seems to be different than the E90's....they do not have a superseding P/N for the F-series slaves. |
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07-29-2017, 01:11 PM | #16 |
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The 550/335is clutch fits on the N55. Mine is running like a champ with 500wtq. The CDV is built in for you guys. Mine is not so maybe a mod to an earlier clutch slave cylinder is possible for you guys.
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07-29-2017, 05:34 PM | #17 |
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To note on this topic I have a 328i 6 speed. I too have felt the clutch "slip" when hard shifting from 1st to 2nd and 2nd to 3rd. Have thought I burnt my clutch up but no smell. I even did the 4th and 5th gear up hill test and the clutch did not slip one bit. So same as others have mentioned I think we have the CDV problem. I have been looking into this and I can confirm the older E90 slave will fit an work just the line will need to be made but I think I will just have a metal braided line made as it seems cheaper.
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07-29-2017, 06:04 PM | #18 | |
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13' 335i M Sport. EBII/Coral Red 6MT. RPI GT exhaust, Resonator delete, PS1, GFB DV , BM3 Stage 2, ER CP, VRSF DP, VRSF 5.5in Stepped FMIC, Dinan Shockware. Carbon M Performance rear diffuser. M4 trunk lip. Conti DWS06 225/40/19 and 255/35/19
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07-29-2017, 06:06 PM | #19 | ||
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13' 335i M Sport. EBII/Coral Red 6MT. RPI GT exhaust, Resonator delete, PS1, GFB DV , BM3 Stage 2, ER CP, VRSF DP, VRSF 5.5in Stepped FMIC, Dinan Shockware. Carbon M Performance rear diffuser. M4 trunk lip. Conti DWS06 225/40/19 and 255/35/19
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07-29-2017, 09:01 PM | #20 |
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The CDV is 100% the culprit. Its sole purpose is to force slipping to occur for smooth engagement regardless of driver style. That was BMW's advancement to manual driving. I'm surprised that E90, or any F series owners have not made this break through and even more so that BMS or others haven't brought this to the market.
Even if you modded it with a stock clutch you win.
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07-30-2017, 10:04 AM | #21 | ||
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07-30-2017, 10:17 AM | #22 | |
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13' 335i M Sport. EBII/Coral Red 6MT. RPI GT exhaust, Resonator delete, PS1, GFB DV , BM3 Stage 2, ER CP, VRSF DP, VRSF 5.5in Stepped FMIC, Dinan Shockware. Carbon M Performance rear diffuser. M4 trunk lip. Conti DWS06 225/40/19 and 255/35/19
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